/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
const path = require("path");
const fs = require("fs");

/**
 * Returns the sha1 commit version of a repository or undefined in case of failure.
 */
function getVersion(repo) {
  const git = path.join(repo, '.git');
  const headPath = path.join(git, 'HEAD');
  let head;
  try {
    head = fs.readFileSync(headPath, 'utf8').trim();
  }
  catch (e) {
    return undefined;
  }
  if (/^[0-9a-f]{40}$/i.test(head)) {
    return head;
  }
  const refMatch = /^ref: (.*)$/.exec(head);
  if (!refMatch) {
    return undefined;
  }
  const ref = refMatch[1];
  const refPath = path.join(git, ref);
  try {
    return fs.readFileSync(refPath, 'utf8').trim();
  }
  catch (e) {
    // noop
  }
  const packedRefsPath = path.join(git, 'packed-refs');
  let refsRaw;
  try {
    refsRaw = fs.readFileSync(packedRefsPath, 'utf8').trim();
  }
  catch (e) {
    return undefined;
  }
  const refsRegex = /^([0-9a-f]{40})\s+(.+)$/gm;
  let refsMatch;
  let refs = {};
  while (refsMatch = refsRegex.exec(refsRaw)) {
    refs[refsMatch[2]] = refsMatch[1];
  }
  return refs[ref];
}
exports.getVersion = getVersion;
